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Cardiopulmonary and Hemodynamic Responses during Exercise on Dry land Vs. Immersible Ergo cycle

S556 Vol. 45 No. 5 Supplement MEDICINE & SCIENCE IN SPORTS & EXERCISE®
ACSM May 28 - June 1, 2013 Indianapolis, Indiana
2815 Board #119 June 1, 9:30 AM - 11:00 AM
Cardiopulmonary and Hemodynamic Responses during Exercise on Dry land Vs. Immersible Ergo cycle
Mauricio Garzon1, Mathieu Gayda2, Mario Leone3, Alain-Steve Comtois4, Anil Nigam2, Martin
1.Cardiovascular Prevention and Rehabilitation Centre (EPIC), Montreal Heart Institute, Université de Montréal, Montreal, QC, Canada.2. Cardiovascular Prevention and Rehabilitation Centre (EPIC), Montreal Heart Institute, Montreal, QC, Canada. 3 University of Quebec in Chicoutimi, Chicoutimi, QC, Canada. 4Université du Québec à Montréal, Montreal, QC, Canada.
Water immersion can affect hemodynamic and cardiorespiratory responses during exercise relative to exercise on dry land. Exercise training in an aquatic environment has added benefits relative to training on land including the unloading effect of water immersion on the limbs, and positive effects on balance.
Purpose: We sought to compare cardiopulmonary and hemodynamic responses during an incremental exercise done on dry land ergo cycle (DE) vs immersible ergo cycle (IE) with immersion to chest level, with both sessions employing the same external power output (Pext).
METHOD S: Thirty-three (33) young healthy subjects (Age: 32±9 years; BMI: 23.6±2.6 kg/m²) performed an incremental exercise tests on IE (immersion to the chest level) and DE of equal external power output. Cardiopulmonary responses were measured in all subjects and hemodynamic responses in 20 of them. External power output (Pext) on IE was calculated according to the general fluid equation Fd = ½. Av2Cd and tangential speed was calculated by 2pr (rpm), 2p(r/2)(rpm) and .2p(r/2)/360°(rpm), for pedals, paddles & rods and legs respectively.
RESULTS: VO2 (p< 0.0001), O2 pulse (p= 0.0001), VCO2 (p=0.0014) were significantly lower during exercise on IE relative to DE. In contrast, RER was significantly higher during IE (p=0.0175). Ventilation, breathing frequency and tidal volume did not differ. Among hemodynamic variables, stroke volume (SV: p=0.0166) and cardiac output (CO: p=0.0244) were higher and C(a-v)O2 (p

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